R-Lines

Starting at the screen’s center, this program draws randomly long lines in a random direction. The lines cannot leave the screen.

At the beginning Mid-way through Nearly done


# Python 2.7.7 Code
# Pygame 1.9.1 (for Python 2.7.7)
# Jonathan Frech 28th of August, 2015

# importing needed modules
import pygame, sys, time, math, os, random

""" CLASSES """
# dummy class for global variables
class dummy():
	pass

""" FUNCTIONS """
# gets the position on a circle
# circle center                           : '_pos'
# circle radius                           : '_radius'
# angle from center to point on the circle: '_angle'
def getCirclePos(_pos, _radius, _angle):
	return [
				_pos[0] + _radius * math.cos(math.radians(_angle)),
				_pos[1] + _radius * math.sin(math.radians(_angle))
			]

# quits the program
def quit():
	sys.exit()

""" TICK; RENDER """
# tick function
def tick():
	# handle events
	for event in pygame.event.get():
		# quit
		if event.type == pygame.QUIT:
			quit()

# render function
def render():
	p = getCirclePos(main.P, random.randint(10, 150), random.randint(0, 359))
	
	for _ in range(0, 2):
		if p[_] < 0:
			p[_] = 0
		elif p[_] > main.SIZE[_]-1:
			p[_] = main.SIZE[_]-1
	
	pygame.draw.line(main.SURF, [255, 255, 255], main.P, p)
	main.P = p
	
	# blit and flip
	main.SCREEN.blit(main.SURF, [0, 0])
	pygame.display.flip()

""" INIT """
# initialize program
def init():
	main.WIDTH, main.HEIGHT = 1080, 720
	main.SIZE = [main.WIDTH, main.HEIGHT]
	main.CENTER = [main.WIDTH / 2., main.HEIGHT / 2.]
	main.SCREEN = pygame.display.set_mode(main.SIZE)
	main.SURF = pygame.Surface(main.SIZE)
	
	main.CAPTION = "R-Lines"
	main.TICKS = 0
	
	main.P = main.CENTER[:]
	
	# functions
	pygame.display.set_caption(main.CAPTION)

""" RUN """
# run function (uses tick() and render())
def run():
	ticksPerSecond = 60
	lastTime = time.time() * 1000000000
	nsPerTick =  1000000000.0 / float(ticksPerSecond)
	
	ticks = 0
	frames = 0
	
	lastTimer = time.time() * 1000
	delta = 0.0
	
	while True:
		now = time.time() * 1000000000
		delta += float(now - lastTime) / float(nsPerTick)
		lastTime = now
		shouldRender = False
				
		while delta >= 1:
			ticks += 1
			main.TICKS += 1
			tick()
			delta -= 1
			shouldRender = True
		
		if shouldRender:
			frames += 1
			render()
		
		if time.time() * 1000 - lastTimer >= 1000:
			lastTimer += 1000
			
			# debug
			# print("Frames: " + str(frames) + ", ticks: " + str(ticks))
			
			frames = 0
			ticks = 0

# main variable
main = dummy()
init()

# start program
run()
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